/* =============================================================================
   Infinite Exploration — design system
   Modern industrial technology: deep navy, charcoal, metallic gray, white,
   restrained cyan accent. Light content surfaces, dark hero/CTA/footer.
   ========================================================================== */
:root {
  --navy-950: #060d18;
  --navy-900: #0b1626;
  --navy-800: #12223a;
  --navy-700: #1b2f4d;
  --charcoal: #15181d;
  --steel-700: #3d4a5c;
  --steel-500: #6b7787;
  --steel-400: #8a95a5;
  --steel-300: #c3cad4;
  --steel-200: #dde2e8;
  --steel-100: #eef1f4;
  --steel-50: #f6f8fa;
  --white: #ffffff;
  --accent: #1fa9d1;          /* restrained cyan */
  --accent-bright: #3cc6ec;   /* on dark surfaces */
  --accent-ink: #0b7ea3;      /* accessible on white */
  --danger: #b42318;
  --success: #067647;

  --text: #18202b;
  --text-muted: #4a5565;
  --text-on-dark: #e8eef5;
  --muted-on-dark: #a9b8cb;

  --font: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  --radius: 6px;
  --radius-lg: 10px;
  --shadow: 0 1px 2px rgba(11, 22, 38, .06), 0 8px 24px rgba(11, 22, 38, .06);
  --container: 1200px;
  --gutter: clamp(16px, 4vw, 32px);
  --header-h: 72px;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 16px); }
body { margin: 0; font-family: var(--font); font-size: 16px; line-height: 1.6; color: var(--text); background: var(--white); -webkit-font-smoothing: antialiased; }
img, svg { max-width: 100%; display: block; }
a { color: var(--accent-ink); text-underline-offset: 3px; }
a:hover { color: var(--navy-900); }
h1, h2, h3, h4 { line-height: 1.2; margin: 0 0 .6em; color: var(--navy-900); letter-spacing: -.01em; }
h1 { font-size: clamp(2rem, 4.2vw, 3.25rem); font-weight: 700; letter-spacing: -.02em; }
h2 { font-size: clamp(1.5rem, 2.6vw, 2.125rem); font-weight: 650; }
h3 { font-size: 1.125rem; font-weight: 600; }
h4 { font-size: .8125rem; font-weight: 600; text-transform: uppercase; letter-spacing: .08em; color: var(--steel-500); margin-top: 1.4em; }
p { margin: 0 0 1em; }
code { font-family: var(--mono); font-size: .9em; background: rgba(0,0,0,.06); padding: .1em .35em; border-radius: 3px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 var(--gutter); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.skip-link { position: absolute; left: 12px; top: -48px; z-index: 100; background: var(--white); padding: 8px 14px; border-radius: var(--radius); }
.skip-link:focus { top: 12px; }
.icon { width: 20px; height: 20px; flex-shrink: 0; }

.eyebrow { font-family: var(--mono); font-size: .75rem; font-weight: 500; letter-spacing: .14em; text-transform: uppercase; color: var(--accent-ink); margin: 0 0 1rem; }
.lead { font-size: 1.125rem; color: var(--text-muted); max-width: 68ch; }
.small { font-size: .875rem; color: var(--text-muted); }

/* ---------------------------------------------------------------- buttons */
.btn { display: inline-flex; align-items: center; gap: .5rem; font: 600 .9375rem/1 var(--font); padding: .9rem 1.35rem; border-radius: var(--radius); border: 1px solid transparent; text-decoration: none; cursor: pointer; transition: background .15s, color .15s, border-color .15s; white-space: nowrap; }
.btn .icon { width: 18px; height: 18px; transition: transform .15s; }
.btn:hover .icon { transform: translateX(2px); }
.btn-primary { background: var(--accent); color: var(--navy-950); }
.btn-primary:hover { background: var(--accent-bright); color: var(--navy-950); }
.btn-ghost { background: transparent; color: var(--navy-900); border-color: var(--steel-300); }
.btn-ghost:hover { border-color: var(--navy-900); color: var(--navy-900); }
.btn-outline-light { background: transparent; color: var(--text-on-dark); border-color: rgba(232,238,245,.35); }
.btn-outline-light:hover { border-color: var(--text-on-dark); color: var(--white); }
.btn-link { padding: 0; color: var(--accent-ink); }
.btn-link:hover { color: var(--navy-900); }
.btn-sm { padding: .65rem 1rem; font-size: .875rem; }
.btn-row { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1.75rem; }

/* ----------------------------------------------------------------- header */
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(11, 22, 38, .96); backdrop-filter: saturate(140%) blur(8px); border-bottom: 1px solid rgba(255,255,255,.06); }
.site-header.scrolled { box-shadow: 0 4px 20px rgba(0,0,0,.25); }
.header-inner { display: flex; align-items: center; gap: 1.5rem; height: var(--header-h); }
.logo { display: inline-flex; align-items: center; gap: .7rem; text-decoration: none; color: var(--white); flex-shrink: 0; }
.logo:hover { color: var(--white); }
.logo-mark { display: block; width: 58px; flex-shrink: 0; }
.logo-mark img { width: 100%; height: auto; }
.logo-text { display: flex; flex-direction: column; line-height: 1.15; }
.logo-text strong { font-size: 1rem; font-weight: 650; letter-spacing: -.005em; }
.logo-text span { font-family: var(--mono); font-size: .625rem; letter-spacing: .16em; text-transform: uppercase; color: var(--muted-on-dark); }

.primary-nav { margin-left: auto; }
.nav-list { list-style: none; margin: 0; padding: 0; display: flex; align-items: center; gap: .25rem; }
.nav-list > li > a, .sub-trigger > a { display: block; padding: .5rem .8rem; color: var(--text-on-dark); text-decoration: none; font-size: .9375rem; font-weight: 500; border-radius: var(--radius); }
.nav-list > li > a:hover, .sub-trigger > a:hover { color: var(--white); background: rgba(255,255,255,.06); }
.nav-list a[aria-current="page"] { color: var(--accent-bright); }
.has-sub { position: relative; }
.sub-trigger { display: flex; align-items: center; }
.sub-toggle { background: none; border: 0; color: var(--muted-on-dark); padding: .4rem .3rem; margin-left: -.5rem; cursor: pointer; border-radius: var(--radius); }
.sub-toggle svg { width: 12px; height: 12px; transition: transform .15s; }
.sub-toggle[aria-expanded="true"] svg { transform: rotate(180deg); }
.submenu { list-style: none; margin: 0; padding: .5rem; position: absolute; top: calc(100% + 10px); left: -1rem; width: 380px; background: var(--white); border-radius: var(--radius-lg); box-shadow: 0 20px 50px rgba(6,13,24,.35); opacity: 0; visibility: hidden; transform: translateY(-4px); transition: opacity .15s, transform .15s, visibility .15s; }
.has-sub:hover .submenu, .has-sub:focus-within .submenu, .has-sub.open .submenu { opacity: 1; visibility: visible; transform: none; }
.submenu::before { content: ''; position: absolute; top: -12px; left: 0; right: 0; height: 12px; }
.submenu a { display: flex; gap: .85rem; padding: .8rem; border-radius: var(--radius); text-decoration: none; color: var(--text); }
.submenu a:hover { background: var(--steel-100); color: var(--text); }
.submenu a .icon { color: var(--accent-ink); margin-top: 2px; }
.submenu strong { display: block; font-size: .9375rem; color: var(--navy-900); }
.submenu small { display: block; color: var(--text-muted); font-size: .8125rem; line-height: 1.45; margin-top: 2px; }
.submenu-all a { justify-content: space-between; font-size: .875rem; font-weight: 600; color: var(--accent-ink); border-top: 1px solid var(--steel-200); border-radius: 0 0 var(--radius) var(--radius); margin-top: .25rem; }
.header-actions { display: flex; align-items: center; gap: .5rem; }
.nav-cta-mobile { display: none; }
.nav-toggle { display: none; width: 44px; height: 44px; background: none; border: 1px solid rgba(255,255,255,.15); border-radius: var(--radius); cursor: pointer; position: relative; }
.bars, .bars::before, .bars::after { position: absolute; left: 50%; width: 18px; height: 1.5px; background: var(--white); transform: translateX(-50%); transition: transform .2s, opacity .2s; }
.bars { top: 50%; }
.bars::before, .bars::after { content: ''; left: 0; transform: none; }
.bars::before { top: -6px; }
.bars::after { top: 6px; }
.nav-toggle[aria-expanded="true"] .bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .bars::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .bars::after { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 980px) {
  .nav-toggle { display: inline-block; }
  .header-actions { margin-left: auto; }
  .primary-nav { position: fixed; top: var(--header-h); left: 0; right: 0; height: calc(100dvh - var(--header-h)); background: var(--navy-900); padding: 1rem var(--gutter) 2rem; overflow-y: auto; display: none; margin: 0; }
  .primary-nav.open { display: block; }
  .nav-list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav-list > li { border-bottom: 1px solid rgba(255,255,255,.08); }
  .nav-list > li > a, .sub-trigger > a { padding: 1rem .25rem; font-size: 1.0625rem; flex: 1; }
  .sub-toggle { padding: .75rem; margin: 0; }
  .submenu { position: static; width: auto; box-shadow: none; background: transparent; opacity: 1; visibility: visible; transform: none; display: none; padding: 0 0 .75rem; }
  .has-sub:hover .submenu, .has-sub:focus-within .submenu { display: none; }
  .has-sub.open .submenu { display: block; }
  .submenu a { color: var(--text-on-dark); padding: .7rem .25rem; }
  .submenu a:hover { background: rgba(255,255,255,.05); color: var(--white); }
  .submenu strong { color: var(--white); }
  .submenu small { color: var(--muted-on-dark); }
  .submenu a .icon { color: var(--accent-bright); }
  .submenu-all a { color: var(--accent-bright); border-top-color: rgba(255,255,255,.08); }
  .nav-cta-mobile { display: inline-flex; margin-top: 1.5rem; width: 100%; justify-content: center; }
}
@media (max-width: 560px) {
  .header-cta { display: none; }
  .logo-text span { display: none; }
}
body.nav-open { overflow: hidden; }

/* ------------------------------------------------------------------- hero */
.hero { background: radial-gradient(1200px 500px at 85% 10%, rgba(31,169,209,.13), transparent 60%), linear-gradient(180deg, var(--navy-900), var(--navy-950)); color: var(--text-on-dark); padding: clamp(3rem, 7vw, 6rem) 0 2.5rem; overflow: hidden; }
.hero h1 { color: var(--white); max-width: 16ch; }
.hero .eyebrow, .page-hero .eyebrow, .section-dark .eyebrow, .cta-band .eyebrow { color: var(--accent-bright); }
.hero .lead { color: var(--muted-on-dark); }
.hero-sub { font-size: 1.1875rem; font-weight: 500; color: var(--text-on-dark); margin-bottom: 1rem; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 3rem; align-items: center; }
.hero-visual { margin: 0; }
.hero-visual svg { width: 100%; height: auto; }
.hero-visual figcaption { font-family: var(--mono); font-size: .6875rem; color: var(--steel-500); text-align: right; letter-spacing: .06em; }
.flow { stroke-dasharray: 6 10; animation: flow 1.6s linear infinite; }
@keyframes flow { to { stroke-dashoffset: -32; } }
@media (prefers-reduced-motion: reduce) { .flow { animation: none; } html { scroll-behavior: auto; } }
.focus-strip { list-style: none; margin: 3.5rem 0 0; padding: 1.25rem 0 0; border-top: 1px solid rgba(255,255,255,.1); display: flex; flex-wrap: wrap; gap: .5rem 2.5rem; font-family: var(--mono); font-size: .75rem; letter-spacing: .1em; text-transform: uppercase; color: var(--muted-on-dark); }
.focus-strip li::before { content: ''; display: inline-block; width: 6px; height: 6px; background: var(--accent-bright); margin-right: .65rem; vertical-align: middle; transform: rotate(45deg); }
@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; } .hero-visual { max-width: 560px; } }

.page-hero { background: linear-gradient(180deg, var(--navy-900), var(--navy-950)); color: var(--text-on-dark); padding: clamp(2.5rem, 5vw, 4.5rem) 0; position: relative; overflow: hidden; }
.page-hero::after { content: ''; position: absolute; inset: 0; background-image: linear-gradient(rgba(159,179,200,.06) 1px, transparent 1px), linear-gradient(90deg, rgba(159,179,200,.06) 1px, transparent 1px); background-size: 28px 28px; mask-image: linear-gradient(90deg, transparent 30%, #000); pointer-events: none; }
.page-hero .container { position: relative; z-index: 1; }
.page-hero h1 { color: var(--white); max-width: 22ch; }
.page-hero .lead { color: var(--muted-on-dark); }
.breadcrumb ol { list-style: none; margin: 0 0 1.5rem; padding: 0; display: flex; flex-wrap: wrap; gap: .4rem; font-size: .8125rem; color: var(--muted-on-dark); }
.breadcrumb li + li::before { content: '/'; margin-right: .4rem; color: var(--steel-500); }
.breadcrumb a { color: var(--muted-on-dark); text-decoration: none; }
.breadcrumb a:hover { color: var(--white); }

/* --------------------------------------------------------------- sections */
.section { padding: clamp(3.5rem, 7vw, 6rem) 0; }
.section-alt { background: var(--steel-50); border-top: 1px solid var(--steel-200); border-bottom: 1px solid var(--steel-200); }
.section-dark { background: var(--charcoal); color: var(--text-on-dark); }
.section-dark h2, .section-dark h3 { color: var(--white); }
.section-dark p, .section-dark .lead { color: var(--muted-on-dark); }
.section-head { max-width: 760px; margin-bottom: 2.75rem; }
.section-head.center { margin-inline: auto; text-align: center; }
.section-head .lead { margin-bottom: 0; }
.section-link { margin-top: 2rem; }
.sub-h { margin-top: 2.5rem; }
.two-col { display: grid; grid-template-columns: 1.3fr 1fr; gap: clamp(2rem, 5vw, 4.5rem); align-items: start; }
.two-col > div > p { color: var(--text-muted); }
@media (max-width: 860px) { .two-col { grid-template-columns: 1fr; } }
.panel { background: var(--white); border: 1px solid var(--steel-200); border-radius: var(--radius-lg); padding: 1.75rem; box-shadow: var(--shadow); }
.panel h2, .panel h3 { font-size: 1.0625rem; }
.panel + .panel { margin-top: 1rem; }

/* ----------------------------------------------------------------- cards */
.division-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
.division-card { position: relative; display: flex; flex-direction: column; padding: 2rem; background: var(--white); border: 1px solid var(--steel-200); border-radius: var(--radius-lg); text-decoration: none; color: var(--text); transition: border-color .2s, box-shadow .2s, transform .2s; }
.division-card::before { content: ''; position: absolute; left: 0; top: 0; right: 0; height: 3px; background: var(--accent); border-radius: var(--radius-lg) var(--radius-lg) 0 0; transform: scaleX(0); transform-origin: left; transition: transform .25s; }
.division-card:hover { border-color: var(--steel-300); box-shadow: 0 16px 40px rgba(11,22,38,.1); color: var(--text); transform: translateY(-2px); }
.division-card:hover::before { transform: scaleX(1); }
.division-num { position: absolute; top: 1.75rem; right: 2rem; font-family: var(--mono); font-size: .8125rem; color: var(--steel-400); }
.division-card h3 { font-size: 1.3125rem; margin-top: 1.25rem; }
.division-card p { color: var(--text-muted); }
.division-card ul { list-style: none; padding: 1rem 0 0; margin: auto 0 1.5rem; border-top: 1px solid var(--steel-200); font-size: .875rem; color: var(--steel-700); }
.division-card li { padding: .3rem 0; }
.card-link { display: inline-flex; align-items: center; gap: .5rem; font-weight: 600; font-size: .9375rem; color: var(--accent-ink); }
@media (max-width: 960px) { .division-cards { grid-template-columns: 1fr; } }

.feature-icon { display: inline-grid; place-items: center; width: 44px; height: 44px; border-radius: var(--radius); background: rgba(31,169,209,.1); color: var(--accent-ink); border: 1px solid rgba(31,169,209,.25); }
.feature-icon.lg { width: 52px; height: 52px; }
.feature-icon.lg .icon { width: 24px; height: 24px; }
.section-dark .feature-icon { color: var(--accent-bright); background: rgba(60,198,236,.08); }
.feature-grid { display: grid; gap: 1.25rem; }
.feature-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.feature-grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
.feature { padding: 1.75rem; border: 1px solid var(--steel-200); border-radius: var(--radius-lg); background: var(--white); }
.feature h3 { margin-top: .25rem; }
.feature .feature-icon + h3 { margin-top: 1.1rem; }
.feature p { color: var(--text-muted); margin: 0; font-size: .9375rem; }
.section-dark .feature p { color: var(--muted-on-dark); }
.section-dark .feature { background: rgba(255,255,255,.03); border-color: rgba(255,255,255,.09); }
@media (max-width: 1000px) { .feature-grid.cols-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 860px) { .feature-grid.cols-3 { grid-template-columns: 1fr; } }
@media (max-width: 600px) { .feature-grid.cols-4 { grid-template-columns: 1fr; } }

.app-grid { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(5, 1fr); gap: 1px; background: rgba(255,255,255,.09); border: 1px solid rgba(255,255,255,.09); border-radius: var(--radius-lg); overflow: hidden; }
.app-grid li { background: var(--charcoal); padding: 1.75rem 1.5rem; }
.app-grid h3 { font-size: 1rem; margin-top: 1.1rem; }
.app-grid p { font-size: .875rem; margin: 0; }
@media (max-width: 1080px) { .app-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 700px) { .app-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 460px) { .app-grid { grid-template-columns: 1fr; } }

.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(5, 1fr); gap: 1.25rem; counter-reset: s; }
.steps li { position: relative; padding-top: 1.25rem; border-top: 2px solid var(--steel-200); }
.steps li::before { content: ''; position: absolute; top: -2px; left: 0; width: 40px; height: 2px; background: var(--accent); }
.step-n { font-family: var(--mono); font-size: .8125rem; color: var(--accent-ink); }
.steps h3 { font-size: 1rem; margin: .5rem 0 .4rem; }
.steps p { font-size: .9rem; color: var(--text-muted); margin: 0; }
@media (max-width: 1000px) { .steps { grid-template-columns: repeat(2, 1fr); row-gap: 2rem; } }
@media (max-width: 560px) { .steps { grid-template-columns: 1fr; } }

.check-list { list-style: none; margin: 0; padding: 0; }
.check-list li { display: flex; gap: .6rem; padding: .3rem 0; font-size: .9375rem; }
.check-list .icon { width: 18px; height: 18px; color: var(--accent-ink); margin-top: 3px; }
.check-grid { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: .5rem 1.5rem; }
.check-grid li { display: flex; gap: .6rem; padding: .75rem 1rem; background: var(--white); border: 1px solid var(--steel-200); border-radius: var(--radius); font-size: .9375rem; }
.check-grid .icon { width: 18px; height: 18px; color: var(--accent-ink); margin-top: 2px; }
@media (max-width: 520px) { .check-grid { grid-template-columns: 1fr; } }

/* ------------------------------------------------------------ progression */
.progression { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border: 1px solid var(--steel-200); border-radius: var(--radius-lg); background: var(--white); overflow: hidden; }
.progression li { padding: 1.75rem; position: relative; }
.progression li + li { border-left: 1px solid var(--steel-200); }
.progression li + li::before { content: ''; position: absolute; left: -9px; top: 50%; width: 16px; height: 16px; background: var(--white); border-top: 1px solid var(--steel-300); border-right: 1px solid var(--steel-300); transform: translateY(-50%) rotate(45deg); }
.progression .eyebrow { margin-bottom: .5rem; }
.progression strong { display: block; font-size: 1.0625rem; color: var(--navy-900); margin-bottom: .4rem; }
.progression p { margin: 0; color: var(--text-muted); font-size: .9375rem; }
@media (max-width: 760px) { .progression { grid-template-columns: 1fr; } .progression li + li { border-left: 0; border-top: 1px solid var(--steel-200); } .progression li + li::before { left: 50%; top: -9px; transform: translateX(-50%) rotate(135deg); } }

/* ---------------------------------------------------------------- subnav */
.subnav { position: sticky; top: var(--header-h); z-index: 20; background: var(--white); border-bottom: 1px solid var(--steel-200); }
.subnav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: .25rem; overflow-x: auto; scrollbar-width: none; }
.subnav ul::-webkit-scrollbar { display: none; }
.subnav a { display: block; padding: .9rem .9rem; font-size: .875rem; font-weight: 500; color: var(--text-muted); text-decoration: none; white-space: nowrap; border-bottom: 2px solid transparent; }
.subnav a:hover { color: var(--navy-900); border-bottom-color: var(--accent); }

/* --------------------------------------------------------------- products */
.products { display: grid; gap: 1.5rem; }
.product { display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(1.5rem, 4vw, 3rem); padding: clamp(1.5rem, 3vw, 2.5rem); border: 1px solid var(--steel-200); border-radius: var(--radius-lg); background: var(--white); scroll-margin-top: calc(var(--header-h) + 64px); }
.product h3 { font-size: 1.5rem; margin-top: .75rem; }
.product-main > p { color: var(--text-muted); }
.product .btn-row { margin-top: 1.5rem; }
@media (max-width: 900px) { .product { grid-template-columns: 1fr; } }
.scope-tags { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: .4rem; }
.tag { font-family: var(--mono); font-size: .6875rem; letter-spacing: .06em; text-transform: uppercase; padding: .3rem .55rem; border-radius: 3px; border: 1px solid; white-space: nowrap; }
.tag-a { color: #0b6b8a; background: #e8f6fb; border-color: #bfe5f2; }
.tag-b { color: #3b4a7a; background: #eef0f8; border-color: #d3d8ec; }
.tag-c { color: #6b5420; background: #faf4e6; border-color: #ecdcb4; }
.note { display: flex; gap: .65rem; font-size: .875rem; color: var(--text-muted); background: var(--steel-50); border: 1px solid var(--steel-200); border-left: 3px solid var(--accent); padding: .9rem 1rem; border-radius: var(--radius); margin-top: 1.25rem; }
.note .icon { color: var(--accent-ink); width: 18px; height: 18px; margin-top: 2px; }

.spec-wrap { overflow-x: auto; border: 1px solid var(--steel-200); border-radius: var(--radius-lg); background: var(--white); }
.spec-table { width: 100%; border-collapse: collapse; font-size: .875rem; }
.spec-table caption { text-align: left; padding: .9rem 1.1rem; font-family: var(--mono); font-size: .6875rem; letter-spacing: .1em; text-transform: uppercase; color: var(--steel-500); border-bottom: 1px solid var(--steel-200); background: var(--steel-50); }
.spec-table thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }
.matrix thead { position: static; width: auto; height: auto; clip: auto; }
.matrix thead th { text-align: left; font-size: .75rem; font-weight: 600; color: var(--steel-500); text-transform: uppercase; letter-spacing: .06em; padding: .75rem 1.1rem; border-bottom: 1px solid var(--steel-200); }
.spec-table th[scope="row"], .spec-table td { padding: .75rem 1.1rem; text-align: left; vertical-align: top; border-bottom: 1px solid var(--steel-100); }
.spec-table tr:last-child th, .spec-table tr:last-child td { border-bottom: 0; }
.spec-table th[scope="row"] { font-weight: 600; color: var(--navy-900); width: 42%; }
.spec-table td.pending { color: var(--steel-500); font-style: italic; }
.matrix th[scope="row"] { width: auto; }
.spec-empty { height: 100%; min-height: 220px; display: flex; flex-direction: column; justify-content: center; gap: .75rem; padding: 2rem; border: 1px dashed var(--steel-300); border-radius: var(--radius-lg); background: var(--steel-50); }
.spec-empty .icon { width: 28px; height: 28px; color: var(--accent-ink); }
.spec-empty strong { display: block; color: var(--navy-900); margin-bottom: .25rem; }
.spec-empty p { margin: 0; color: var(--text-muted); font-size: .9375rem; }
.spec-empty a { display: inline-flex; align-items: center; gap: .4rem; font-weight: 600; font-size: .9375rem; text-decoration: none; }

/* ------------------------------------------------------- solutions index */
.division-rows { display: grid; gap: 1.5rem; }
.division-row { display: grid; grid-template-columns: 1.2fr 1fr; gap: clamp(1.5rem, 4vw, 3.5rem); padding: clamp(1.5rem, 3vw, 2.5rem); border: 1px solid var(--steel-200); border-radius: var(--radius-lg); align-items: start; }
.division-row h2 { margin-top: 1.25rem; font-size: 1.625rem; }
.division-row h2 a { color: inherit; text-decoration: none; }
.division-row p { color: var(--text-muted); }
.link-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--steel-200); }
.link-list a { display: flex; justify-content: space-between; align-items: center; padding: 1rem 0; border-bottom: 1px solid var(--steel-200); text-decoration: none; color: var(--navy-900); font-weight: 500; }
.link-list a:hover { color: var(--accent-ink); }
.link-list .icon { width: 18px; height: 18px; color: var(--steel-400); }
@media (max-width: 860px) { .division-row { grid-template-columns: 1fr; } }

.three-col-blocks { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
.three-col-blocks article { padding: 2rem; border: 1px solid var(--steel-200); border-radius: var(--radius-lg); }
.three-col-blocks h2 { font-size: 1.25rem; margin: 1.25rem 0 1rem; }
@media (max-width: 900px) { .three-col-blocks { grid-template-columns: 1fr; } }

/* ------------------------------------------------------------ loop diagram */
.loop-diagram { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; counter-reset: l; }
.loop-diagram li { position: relative; display: grid; grid-template-columns: 2.25rem 1fr; column-gap: 1rem; padding: 1rem 1.25rem; background: var(--white); border: 1px solid var(--steel-200); border-radius: var(--radius); counter-increment: l; }
.loop-diagram li::before { content: counter(l, decimal-leading-zero); grid-row: span 2; font-family: var(--mono); font-size: .8125rem; color: var(--accent-ink); align-self: center; }
.loop-diagram li + li { margin-top: 1.5rem; }
.loop-diagram li + li::after { content: ''; position: absolute; top: -1.5rem; left: 2.15rem; width: 2px; height: 1.5rem; background: repeating-linear-gradient(var(--accent) 0 4px, transparent 4px 8px); }
.loop-diagram strong { color: var(--navy-900); }
.loop-diagram span { font-size: .875rem; color: var(--text-muted); }

.facts { display: grid; grid-template-columns: auto 1fr; gap: .6rem 1.25rem; margin: 0; font-size: .9375rem; }
.facts dt { color: var(--steel-500); }
.facts dd { margin: 0; font-weight: 500; color: var(--navy-900); }

/* --------------------------------------------------------------- CTA band */
.cta-band { background: radial-gradient(800px 300px at 90% 0%, rgba(31,169,209,.18), transparent 60%), var(--navy-900); color: var(--text-on-dark); padding: clamp(3rem, 6vw, 5rem) 0; }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 2rem; flex-wrap: wrap; }
.cta-band h2 { color: var(--white); margin-bottom: .5rem; }
.cta-band p { color: var(--muted-on-dark); margin: 0; max-width: 60ch; }
.cta-band .btn-row { margin: 0; }

/* -------------------------------------------------------------------- RFQ */
.rfq-layout { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: clamp(2rem, 4vw, 3.5rem); align-items: start; }
.rfq-aside { position: sticky; top: calc(var(--header-h) + 24px); }
@media (max-width: 980px) { .rfq-layout { grid-template-columns: 1fr; } .rfq-aside { position: static; } }
.config-banner { background: #fff8e6; border: 1px solid #f0d58a; color: #5c4508; padding: 1rem 1.15rem; border-radius: var(--radius); margin-bottom: 1.5rem; font-size: .9rem; }
.rfq-form fieldset { border: 1px solid var(--steel-200); border-radius: var(--radius-lg); padding: 1.5rem; margin: 0 0 1.25rem; min-width: 0; }
.rfq-form legend { font-weight: 650; color: var(--navy-900); padding: 0 .5rem; margin-left: -.5rem; font-size: 1.0625rem; }
.rfq-form fieldset[data-category-group] { border-color: rgba(31,169,209,.45); background: linear-gradient(180deg, rgba(31,169,209,.04), transparent 120px); }
.field-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.1rem 1.25rem; }
.field.full { grid-column: 1 / -1; }
@media (max-width: 640px) { .field-grid { grid-template-columns: 1fr; } }
.field label { display: block; font-size: .875rem; font-weight: 600; color: var(--navy-900); margin-bottom: .35rem; }
.req { color: var(--danger); }
.opt { font-weight: 400; color: var(--steel-500); font-size: .8125rem; }
.field input, .field select, .field textarea { width: 100%; font: inherit; font-size: .9375rem; color: var(--text); padding: .7rem .8rem; border: 1px solid var(--steel-300); border-radius: var(--radius); background: var(--white); transition: border-color .15s, box-shadow .15s; }
.field textarea { resize: vertical; min-height: 110px; }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(31,169,209,.2); }
.field input[type="file"] { padding: .6rem; background: var(--steel-50); }
.field [aria-invalid="true"] { border-color: var(--danger); }
.field-error { color: var(--danger); font-size: .8125rem; margin: .35rem 0 0; }
.hint { font-size: .8125rem; color: var(--steel-500); margin: .35rem 0 0; }
.sub-fieldset { margin-top: 1.5rem; padding-top: 1.25rem; border-top: 1px dashed var(--steel-300); }
.sub-legend { font-weight: 600; color: var(--navy-900); margin-bottom: 1rem; }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.consent { display: flex; gap: .65rem; margin-top: 1.25rem; font-size: .875rem; color: var(--text-muted); }
.consent input { margin-top: .25rem; width: 16px; height: 16px; flex-shrink: 0; accent-color: var(--accent-ink); }
.turnstile:empty { display: none; }
.turnstile { margin-top: 1rem; }
.form-actions { display: flex; align-items: center; gap: 1.25rem; flex-wrap: wrap; }
.form-actions .hint { margin: 0; }
.btn[disabled] { opacity: .6; cursor: progress; }
.form-status { margin-top: 1.25rem; padding: 1rem 1.15rem; border-radius: var(--radius); font-size: .9375rem; }
.form-status.ok { background: #ecfdf3; border: 1px solid #a6e9c4; color: var(--success); }
.form-status.err { background: #fef3f2; border: 1px solid #fecdca; color: var(--danger); }
.form-status.warn { background: #fff8e6; border: 1px solid #f0d58a; color: #5c4508; }
.mini-steps { margin: 0; padding-left: 1.2rem; font-size: .9375rem; color: var(--text-muted); }
.mini-steps li { padding: .25rem 0; }

.prose { max-width: 760px; }
.prose h2 { font-size: 1.25rem; margin-top: 2rem; }
.prose p { color: var(--text-muted); }

/* ----------------------------------------------------------------- footer */
.site-footer { background: var(--navy-950); color: var(--muted-on-dark); padding: 4rem 0 2rem; font-size: .9rem; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 2rem; padding-bottom: 2.5rem; border-bottom: 1px solid rgba(255,255,255,.08); }
.footer-brand p { margin-top: 1.25rem; max-width: 38ch; }
.footer-h { font-family: var(--mono); font-size: .6875rem; font-weight: 500; letter-spacing: .14em; text-transform: uppercase; color: var(--steel-400); margin-bottom: 1rem; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { padding: .3rem 0; }
.site-footer a { color: var(--text-on-dark); text-decoration: none; }
.site-footer a:hover { color: var(--accent-bright); }
.footer-bottom { display: flex; justify-content: space-between; gap: 1rem 2rem; flex-wrap: wrap; padding-top: 1.5rem; font-size: .8125rem; }
.footer-bottom p { margin: 0; }
@media (max-width: 860px) { .footer-grid { grid-template-columns: 1fr 1fr; } .footer-brand { grid-column: 1 / -1; } }
@media (max-width: 480px) { .footer-grid { grid-template-columns: 1fr; } }

@media print { .site-header, .subnav, .cta-band, .site-footer { display: none; } }

/* ----------------------------------------------------- key spec highlights */
.highlights { background: var(--navy-950); color: var(--text-on-dark); border-top: 1px solid rgba(255,255,255,.08); padding: 1.75rem 0 1.25rem; }
.hl-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; margin: 0; }
.hl-grid div { display: flex; flex-direction: column-reverse; gap: .3rem; border-left: 2px solid var(--accent); padding-left: 1rem; }
.hl-grid dd { margin: 0; font-size: 1.5rem; font-weight: 650; color: var(--white); letter-spacing: -.01em; }
.hl-grid dt { font-size: .8125rem; color: var(--muted-on-dark); line-height: 1.45; }
.hl-note { margin: 1rem 0 0; font-size: .75rem; color: var(--steel-400); }
@media (max-width: 900px) { .hl-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 420px) { .hl-grid { grid-template-columns: 1fr; } }
.spec-note { font-size: .75rem; color: var(--steel-500); margin: .6rem .25rem 0; line-height: 1.5; }

/* ------------------------------------------------------------------- tabs */
.tabs { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; margin-bottom: 1.5rem; }
.tab { text-align: left; font: inherit; cursor: pointer; padding: 1rem 1.15rem; border: 1px solid var(--steel-300); border-radius: var(--radius-lg); background: var(--white); color: var(--text); transition: border-color .15s, box-shadow .15s, background .15s; }
.tab strong { display: block; font-size: 1rem; color: var(--navy-900); }
.tab span { display: block; font-size: .8125rem; color: var(--text-muted); margin-top: .15rem; }
.tab:hover { border-color: var(--steel-400); }
.tab[aria-selected="true"] { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); background: linear-gradient(180deg, rgba(31,169,209,.06), transparent); }
@media (max-width: 520px) { .tabs { grid-template-columns: 1fr; } }